That's a great question I always see USA vloggers driving and using the camera, the latest was Colleen Ballinger while pregnant.
it's not that hard to buy a hands free, they are a couple of pound on ebay. I don't understand it. I could never vlog and drive, it's insane. And yes in the Uk you get short thrift.
A kid who just passed his test lost his car after he used an app to find a garage while driving to replace a tyre, and he had his phone on his lap.
During that Pokemon Go crazy I saw a ton of people in the Uk driving and using their phones, fortunately that craze was short-lived.